A two-stage short-range nitrification anammox-endogenous denitrification and phosphorus removal process to achieve simultaneous nitrogen and phosphorus removal from urban domestic sewage

Abstract

The invention discloses a two-stage short-range nitrification anaerobic ammonium oxidation-endogenous denitrification dephosphorization process for realizing simultaneous denitrification and dephosphorization of urban domestic sewage. Municipal sewage first enters the A‑AOA‑SBR reactor, and in the first anaerobic stage, the biodegradable organic matter is converted into PHAs, and the phosphorus-accumulating bacteria store the internal carbon source while releasing phosphorus; then part of it is rich in phosphorus and NH 4 + ‑N supernatant enters the OA‑SBR reactor, part of the NH 4 + ‑N oxidation to NO 2 ‑ ‑N, remaining NH during the hypoxic phase 4 + ‑N and NO 2 ‑ ‑N undergoes anaerobic ammonium oxidation reaction; at this time, phosphorus, NO 2 ‑ -N, NO 3 ‑ ‑N supernatant is returned to the A‑AOA‑SBR reactor, and in the second anaerobic stage DPAOs utilize internal carbon sources to convert NO 2 ‑ ‑N and NO 3 ‑ ‑N is an electron acceptor for denitrification and phosphorus removal, and then the remaining NH after the first anaerobic stage is 4 + ‑N oxidation to NO 2 ‑ ‑N and NO 3 ‑ ‑N, and finally use endogenous denitrification with anaerobic ammonium oxidation to further remove nitrogen and phosphorus in the anoxic stage to achieve efficient removal of pollutants.

Description

Technical field [0001] The present invention relates to a low-carbon nitrogen ratio of domestic sewage deep denitrification technology, belongs to the field of sewage biological treatment technology. Specifically, the domestic sewage first enters the A-AOA-SBR reactor for carbon capture and phosphorus release reaction, and after precipitation, the effluent enters the OA-SBR reactor for aeration for short-range nitrification, when the reactor is NH 4 + -N / NO 2 - -N is 1.0 ~ 1.5 when the aeration is stopped, followed by anaerobic ammonia oxidation reaction denitrification by hypoxic stirring, and PO is contained after precipitation 4 3- -P、NO 3 - -N、NO 2 - The effluent of -N is then returned to the A-AOA-SBR reactor, where phosphorus denitrification is carried out in the second anaerobic stirring phase, followed by aeration to remove the remaining NH after the end of the first anaerobic stage 4 + -N, and finally enter the hypoxic section for denitrification and phosphorus remo...

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Problems solved by technology

[0005] The present invention proposes a two-stage short-range nitrification anammox-endogenous denitrification dephosphorization process, realizes simultaneous denitrification and dephosphorization of urban domestic sewage, and solves the problems of high energy consumption and large sludge output in traditional sewage treatment plants

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